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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a5d4ee9edab42d45d8e432cbafc76d9b868f9dd27639a7a4343b485f3fbc35' 
  AND token = '0Vx7T3czeOtEUECpdgfZDMvfjl6OLla02XJhDMeWNdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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