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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bdfa9ede2f99ff26a678baf66b87d05fba64a0bda9b2fd4acac8243c9f1b7f2' 
  AND token = 'fBBRimFANguheAnJhEqnEap8hK+XZsWyRbjLK2UEjkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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