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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9e5aff956eea8e87399e7f7c794f90c81adddc849db06f3ee311ca5a520588' 
  AND token = 'qNIWa0/hwJpeGjGIfj9Z+37x9gAuGG/AorBqTQ6xnnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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