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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9232b2dc21c1f9b0bc37de9b5e3c9c3ec6877b3718f8cc89ee9f14c3d3822c' 
  AND token = 'lsM4FGOSPEmB6JHyJfebnQpEjKRi2c2LkgOr3PHJni0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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