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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8c653b5c184f97824de7a84e66fd270ff2a5e5fe286b645eca172f10102063' 
  AND token = 'Lh7aDzLNMtc8ATHFKiX5HP8sURP2w9OKLHQhKan+X+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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