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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45fac13ad22cc163fb1de7a8953fa7d82560b25a030fe62c44043d50815958fd' 
  AND token = 'e1GVemdUwHPVYLKufBc2O0eh9kWHYhV1GDhkKORVwuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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