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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128ff5c58d68810eea48a300496f70a174d42bfa8cd3b0617d5565ce46690a17' 
  AND token = 'pSJdGGfQQoDx2qnPN26QTc2HaSbef7tFSqrPh0kl9mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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