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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcafb40b65cf2bc509e9a8e338dd555ba1f3f93c7ebc1282233dd42b65da17e' 
  AND token = 'eZjkkevm9EfctxWXt6TLVnEEkfPdM3AtjfLP2mCVAgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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