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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84412af71e6921a247c30806c9ee022b96d4862083d08b96903eda1e33461362' 
  AND token = 'eo9oGtMHxO0K4A71oDYSvtJ+Ezof/FoWGl5jgKL2C1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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