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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7750e58bd66279a3ba1f1b5d8f93db1c5c4b972174ff814956d07d1c019f73' 
  AND token = '99P4R5L7ypr0+HHXKSG9au9ROCiHZ9EbEBfqSg74cpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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