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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2979ca191b76f5361694702905cd4a6ae46f20b731dae037bb37ea9a84a147f' 
  AND token = 'wiCnK+cXI924UFMqlvCYDxial5qVq2LxBiR3bRGU9Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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