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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50f511667521fae9f09143c36f951b6d0d85f12210f477b828daf90880392f5' 
  AND token = '6235w67TNFr9HurIZ0hfFIRDcRhRDgNr9+pN+aJeHnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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