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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079a13b08e828e25f71cdb9a75f3c9bc74b96d71dfced8a447e6ac34955e554a' 
  AND token = '11eehtBu8CPvJnpLYlVhlS3drkz5dZKedX463ALolb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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