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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ef43af92af9c60f74dbc47fff3bc720bce257b31fd99827bd7a2332e2c9a03' 
  AND token = 'Y77w8olHAOGIqIWNxDQyETOak/6wGxjHlea6pdSN7V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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