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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8d06f3cd27ca81de97228efee8cc59c18f3e1d4f9328f640a2a07d61245e4a' 
  AND token = 'NN7fNGqOlMI1KrB7Nh5yPePeU1klGnuENb0fzEhZIow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}