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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf2219f9babb7fce55ef5b91aa4915e7fb89f504d468354c90cf876bf910286' 
  AND token = 'lrCtwWRoI9yr9rCJIatAEy1KPE8eQRlHO2MzdsvO1V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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