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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f83d2e3f6e9426801c182200ea2e97596c30d1c3f977fb7c42bee539025b5b4' 
  AND token = 'kg2mhFPDJ0rGsrLipeDsiELTIdYXpFZZQfbsdRes1cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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