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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807af507c10f101181ed94e9a6c220ce700ff6f72ef7b42b5deda52e91f0f9b5' 
  AND token = 'caW/UI/4hsPKArjzBj4KyAUgWiX00SpX3E+csOoXS6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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