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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e3e3f4a9c0c67a46b78a47b57db3beec78818e4339f71838d37a6a7f478da8' 
  AND token = '93x+Ig5hrKg8XRLgAH30q5qeg1lsRXlSZR30Bo3e8ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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