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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca714451fd03e9b401d62a15fe362a3fd1115527e8a886d077a4c7fb19a9048d' 
  AND token = 'FBeA+qDofe9ZYjNHQuEBeM4o8L5qD/gqjG1J3P8BF9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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