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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91efff903e488b2190e7ccf8f31c3fcbd8d0f846843ed1ee3fb3534ffc3627ad' 
  AND token = 'KO2zLOgc05lx7gkoIJiWsKGh2MYvM48Gh2Spa7rTddE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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