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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604dab1a75c5c2b097d83b12cf3c216e683f45a14e7e4ae65bae2942d2a73aec' 
  AND token = 'VMlku2L7RUuZPH/Fd3PTt+ztRfpIqzZajIANMjp+Qok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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