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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee31a83f44720e823f6d7b7096d22c5827c314a24452acd3cd27bda07cf2868' 
  AND token = 'QMwB+QcBd1DxbXn5686HEYzZ8/1vFJf4dPwtxiD8Yrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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