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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977f69d48f8eef9ec6f318f827ee06fb373240f0c73986c00d2062f9f12152d6' 
  AND token = 'pVwtz7lpXmNGqS08bYQToLmb6E/ZYXhaFeAaLMo+wHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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