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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e4f191881850cf983bcaea7084eb7cff63cde80b819957d4ea4ff2e2a625e9c' 
  AND token = 'oeaRGzMERrl3ekLJMQbWS5j/pAqnnusK9Rw5zemoMaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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