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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010511354f818b7d90807bd6cb4d0a48eabe7948e3315bf8c4d998bc874bbe84' 
  AND token = 'sfmNX6vyqNV9nmZli8Q9Pn21Liar1yB9bKQd2Mn2TZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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