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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0960888281974db4279ef6a1373c3bd4caeb3a319a2fea5f36f3060422745bc' 
  AND token = 'f0njymI7XJwv7rLjB24WSAFK1QZUAe1T1IhJOFGvybQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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