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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c653c263f7ae06e91f36806b42145039a5e7614c68585d65e71f7f2464f6318' 
  AND token = 'UO4jjlCuNM+qTnpWyn5AV1jjvjOlnqEPP+xOvnp76Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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