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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37ff0b1117df3669b18eef4ad0304880bc7c1335f681d3357dd156de6717780' 
  AND token = 'UzUVcl78QGLxL1BXk83SzhpIjseMXqi640hJzaPR2WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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