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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ce07a2134944f7e2c903ce33d58d4fe2c3014a499870fa217961e3a387392c' 
  AND token = 'p6jviILkTkj3/dU3yXvG6dH16K3E9YuchtcjwuS2BAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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