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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a08390d35c0e7d42815824fd0495c5c4c64632fe96862282ee06734fbce2c53' 
  AND token = 'mkTPNYd6x45VWLfhCz5Zr/H7/S6CQ5QwhL8qj/dTfqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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