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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3234aa68675f45883b6be765c7be574719a4f4c30a51fdc62f28b0cef1c95037' 
  AND token = 'p1QL/U26/IgS1NN18i1nVlEBnm/xN1Bp7dr552bO9M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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