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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdb2628d3b343cb6d7bb2c49e55f24041e01290a3fd6ef0cd4a951c3d1a20a9' 
  AND token = '98HHsQP33/YsjxNQn3ZCNmt8me1Qes8zXkEbwxHe24o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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