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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebefc316a306f614736fbde05109894ca80a36046cc182f23267c70b2a121c0' 
  AND token = 'i9HOX5OS6h6Mww7sZCJEEe56A3FlZD5rosSB50zFtSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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