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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5be3351a223a88faa3ca6d3849414d37ee93534e5f5a8cd843e15272c41ea2' 
  AND token = 'Crf7I8QOebgXUtnTb3bB3WzoaDraz0oPZBAQEcUlTRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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