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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecffbc3b8a5ecb5713e7a4013939cc2fa6c8b3b52213342d160ec8e5643bfe5' 
  AND token = 'PsMcbDn+DXEnx4maRIj9TWcBwJiah6C75rFsu9tI8X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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