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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d1817dcb9e214b305e01520a331a62c5e268641d2fc08286755924fbd6e5bc' 
  AND token = 'v0WxOBrXLWO9ucwEzQZvScVCqZ0E8hnPs/4cNi4DxUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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