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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '455e29312b6b01f0d532a826cb4838d541ed913f2b67aff0cf4033431c5b66d2' 
  AND token = 'iGCej5BPnlb9RH7/u8jQbZd3cabwOOCxNtbUVGmVr7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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