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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec7c09e8526d77042111dfe4badb20c1b79065a6059f15ba5f3cb52f43a46ec' 
  AND token = '5q6NJF1utjrq3V4awz8mqoi7uCOp8xQq+oD69lWOlZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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