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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62c33d5124426908ed5c4e608474afe05f81beda4ea7d8c8dfeff56604bbff1' 
  AND token = 'zph39PJMBbyT+iJ4I1tbmd5bMtPN/U9/x9gQhm9nIuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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