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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0efbd766f2f8c0ec4d988a069ae16eb70e864cddb200be17a84b01cc0412affa' 
  AND token = 'VaMysr5MRHiJuA05o2HI3r9G/+aWFwfdG28ZsCl86vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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