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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62fe05a696b75b3ec606f6ed4a3ee2cb31cadd8cfd1aa373977d177ca4e1787' 
  AND token = 'oEKCUKlRXol6ngxeL3H/L7WagXHkVVEW9HoXmPtSrXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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