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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98114d218d24ea460047489bd327a79385ac2c4277c64184893a0df4745a22b9' 
  AND token = '5vDXMT6z0EY0FG9Z6BrWM8LkCWIZYNl5uHMFBJQ3NTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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