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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90aca0c2728a7a868b2939c64148a802bc5735e15584b4c53291b656b6e9530' 
  AND token = 'jqhGU1bsq6xU9uOsx3hFHPFldCV7xj89F+z0KlUCZ54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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