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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e208b11ab08015e7ac0bba09a82bc6f0d4f32a844110e97b7a19b2b331705ec5' 
  AND token = '7MKs5OhEleSlrgUILzO2OGQXupENg+uOysl4L4Vbaf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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