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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ec7f08496a78bcbc101f34312339465b03127c999864afae2d75f4b737e436' 
  AND token = 's44SEB7fmKcIMRIqZHDf/OePu60Q9usRU5BCoSkaHN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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