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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6ea512e86abc67b80f0f65dae9eb4a0a07398230d57f8ebaf2a86112f59162' 
  AND token = 'KnJEJsIW9QKihhby0noBKwCRbejoy1v5kWwFFgyIpMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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