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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18458248368b807090544ffd4bd58a8f93bbdac99319bfdb835fc249fe39a4e8' 
  AND token = 'lpqgI8b1qX4H8a6FojV857sCN2O+RPieqZ7MbQldsq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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