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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada0801db4396ca1f0c137f0ed89cbfc33618cc61f46fbf4ba090e5ac6ae593b' 
  AND token = 'DtFq/n6tBcTZVE3rBW/ttXmKcKCkoZTfJSt5s5Jn6aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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