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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d00e1e2ee4a82565cf0f09b6ad86643710cfe40fe0ab2d5597287e2e27af880' 
  AND token = 'aL7LlrAO0umP2PXAxuHR8juw7dIaYci4+2+GpTey1NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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