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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057cb5cba972dc674ef2e295a9dd482e19e0efd39f43f46164d6261836e1371b' 
  AND token = 'dWxqKpKF27/Ym+WqNqGRL3dYAjQR7exNbrNiTdVYq/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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