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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb882d72ff775dcb81be40907000ee2bc5b6c5302fd3b70dbfc6c392c94470f' 
  AND token = 'WOhbjRgUW7i4hZU0Lq94c8A4rvjKYvHLb+iNTOhkUkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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