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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8c47c11cc11205bf34b216f0864149b5d5ab5a67abf4320c69dc1299164e52' 
  AND token = 'N9Jyqi5JU4VMqU2Hb3ZUlLW+aD8Fxlfg0VVZ0YrSfz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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