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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4726c9183a3a2d44dcd729936c59595c6de859f7a5d563f619567a4f555a13c8' 
  AND token = 'SSk9DmhxGzrSUAli1OQ0KesZQMt1ngWjv2+SE2CKpf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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